New York and New Jersey terror suspect Ahmad Khan Rahami worked as an unarmed guard for a private security firm, the Associated Press reported.

As well as working in his father’s New Jersey chicken restaurant, Rahami had worked as a guard in the AP’s own offices, spending two months as a night guard in an administration office in Cranbury, New Jersey, in 2011.

New York and New Jersey bombings: who is suspect Ahmad Khan Rahami?

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The AP quoted its own chief of global security, Danny Spriggs, who said Rahami spoke with colleagues about his views on politics, including his stance against the US military intervention in Afghanistan. Spriggs said Rahamihad also showed sympathy for the Taliban.

The FBI conducted a preliminary investigation into Rahami after his father contacted them following a 2014 stabbing to express concerns that his son was a terrorist.

“In August 2014, the FBI initiated an assessment of Ahmad Rahami based upon comments made by his father after a domestic dispute that were subsequently reported to authorities,” the bureau confirmed in a statement.

The FBI did not clarify if it interviewed Rahami, who was captured in a shootout with police yesterday, in 2014, but confirmed it conducted a preliminary investigation. Rahami was not on any US watchlist, a US official confirmed.

A blood-stained notebook was in Rahami’s possession when police caught him on Monday. It was filled with extremist ramblings, referring to Anwar al-Awlaki, an American-born radical Muslim cleric killed in a 2011 CIA-led drone strike; and Nidal Hasan, the former US army major who killed 13 people in a shooting rampage at the Fort Hood military post.

“Two years ago I go to the FBI because my son was doing really bad, OK?” Mohammad Rahami told the New York Times. “But they check almost two months, they say, ‘He’s OK, he’s clean, he’s not a terrorist.’ I say OK.”

He added: “Now they say he is a terrorist. I say OK.”

A law enforcement official told the Associated Press that the FBI looked into the matter, but that Mohammad Rahami later retracted his comment and said he meant that his son, Ahmad Khan Rahami, was hanging out with the wrong crowd, including gangs.

The FBI reviewed its databases and found no credible connection to terrorism or threat to the US from the son, the official said.

Rahami was arrested for stabbing a person in the leg and possession of a firearm in 2014. But a grand jury declined to indict him, despite a warning from the arresting officer that Rahami was likely “a danger to himself or others”.

The official who spoke to AP insisted on anonymity to discuss an ongoing investigation.

So far Rahami has not been charged with terrorism offences or charges related to the bombs. Instead, he was charged with five counts of attempted murder of a police officer and two second-degree weapons charges, all of which result from his arrest in Linden, New Jersey, on Monday. More charges were expected to be brought against him in federal court, and on Tuesday the US attorney general, Loretta Lynch, said the explosions were being investigated “as an act of terror”.

He is being held on $5.2m bail and remains in the hospital in critical but stable condition, after surgery for a gunshot wound to his leg. New Jersey congressman Tom MacArthur, who was briefed by the FBI, said Rahami required multiple surgeries due to gunshot wounds to his leg, forearm and shoulder from his gun battle with police.

Police have not yet been able to interview him in depth, the New York police commissioner, James O’Neill, said on Tuesday.

Rahami had been arrested in 2014 on weapons and aggravated assault charges for allegedly stabbing a relative in the leg, the New York Times reported citing court documents, and spent over three months in jail before being released without indictment. He also spent a day in jail in 2012 for allegedly violating a restraining order, the paper reported. Although he was not on any terror or no-fly watch lists, he had been interviewed for immigration purposes traveling between the US and Afghanistan, an anonymous law enforcement official told the AP.

William Sweeney, the FBI’s assistant director in New York, said on Monday that the FBI had got a report of a domestic incident involving Rahami some time ago, but the allegations had been recanted, and “there’s nothing to indicate that currently he was on our radar”.

Initial analysis of the various bombs indicated minimal technical sophistication, according to a US official briefed on the investigation. Some investigators believe the bombs resemble designs released on to the internet by al-Qaida’s Yemeni affiliate through its Inspire publication.

“It’s something any 12-year-old could do if he had access to Christmas lights, a phone and ball bearings,” the US official said.

Officials have said they have no other suspects at large, but cautioned they are still investigating. “It’s a good sign that we found him in a doorway,” O’Neill told CBS on Tuesday. “Hopefully that means he had nowhere to go.”

A Taliban spokesman, Zabiullah Mujahid, told ABC News that there was no link between Rahami and his group.

Rahami was spotted on surveillance video in Chelsea on Saturday evening carrying a backpack and two other bags, the New York Times reported, with later footage showing him without the backpack and leaving one of the other bags by a mailbox.

His fingerprints and DNA were found at the scene of the Manhattan bombing, the AP reported, citing anonymous law enforcement officials. His uncovered face was clearly captured by surveillance cameras near the spot of the blast. Electronic toll records show a car to which he had access was driven from New Jersey to Manhattan and back to New Jersey the day of the bombing, according to the officials. Authorities pulled it over on Sunday night while it was headed in the direction of Kennedy airport. The law enforcement officials said at least one of Rahami’s relatives was in the car. All five were questioned and released.

Conflicting information filtered out from friends and officials about visits by Rahami to Afghanistan or Pakistan. Police are looking into whether he was radicalized while abroad, Reuters reported.